XML Digital Signatures for Widgets support in Opera Presto 2.10

Opera Presto offers support for the following sections of the W3C XML Digital Signatures for Widgets. For your reference,
items are hyperlinked to their place in the online W3C XML Digital Signatures for Widgets document.

This is a revision to Canonical XML Version 1.0 to address issues related to inheritance of attributes in the XML namespace
when canonicalizing document subsets.

This includes the requirement not to inherit xml:id, and to treat xml:base URI path processing
properly.

Canonical XML Version 1.1 is applicable to XML 1.0 and defined in terms of the XPath 1.0 data model.

It is not defined for XML 1.1.

No

Author signature

An author signature is a widget signature with a signature file name that adheres to the naming convention for an author
signature, and has a role element whose URI attribute is equivalent to the author role attribute
value.

It is intended to be generated by the author of the widget (i.e., the entity or entities whom claim authorship over the
content of the widget package).

A widget package can contain zero or one author signatures.

The author signature can be used to determine:

Which entity alleges to have authored the widget.

That the integrity of the widget is as the author intended.

Whether two widgets came from the same author.

Yes

Distributor signatures

This is a widget signature with a signature file name that adheres to the naming convention for a distributor signature,
and has a role element whose URI is equivalent to the distributor role attribute value.